10,000 Birds

DECEMBER 14, 2021

As of mid-November 2021, the Collaborative had submitted more than 4,200 checklists (up from 1,700 in 2018) and has observed 691 species in the United States (up from 618). Thus, there are now seven states with 200+ observed species. The state with the largest increase was Arizona , with 139 species added.

United States 193

United States West Virginia Puerto Rico Minnesota 193

10,000 Birds

DECEMBER 21, 2011

The main wintering area for Ross’s Goose ( Chen rossii ) is presently in the Central Valley of California, though increasing numbers winter in Arkansas, Louisiana, New Mexico, Texas, and the north-central highlands of Mexico 1. Map courtesy of Terry Sohl at South Dakota Birds and Birding.

Geese 152

Geese South Dakota Sacramento Arkansas 152

10,000 Birds

NOVEMBER 13, 2018

As of mid-October 2018, the Collaborative had submitted more than 1,700 checklists and observed 618 species in the United States. The heat map is revealing: Unsurprisingly for a site founded and run by two New Yorkers (one of whom literally wrote the book on birding New York), the Empire State boasts the highest number of species (316).

Rhode Island 114

Rhode Island United States West Virginia Puerto Rico 114